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ISGREATER(3)		   Linux Programmer's Manual		  ISGREATER(3)

NAME
       isgreater,  isgreaterequal, isless, islessgreater, isunordered - macros
       to test a relation

SYNOPSIS
       #include <math.h>

       int isgreater(x,y);

       int isgreaterequal(x,y);

       int isless(x,y);

       int islessequal(x,y);

       int islessgreater(x,y);

       int isunordered(x,y);

       Compile with -std=c99; link with -lm.

DESCRIPTION
       The normal relation operations (like less) will fail if one of the  op‐
       erands is NaN. This will cause an exception. To avoid this, C99 defines
       these macros. The macros are guaranteed to evaluate their operands only
       once.  The operand can be of any real floating-point type.

       isgreater()
	      determines (x) > (y) without an exception if x or y is NaN.

       isgreaterequal()
	      determines (x) >= (y) without an exception if x or y is NaN.

       isless()
	      determines (x) < (y) without an exception if x or y is NaN.

       islessequal()
	      determines (x) <= (y) without an exception if x or y is NaN.

       islessgreater()
	      determines (x) < (y) || (x) > (y) without an exception if x or y
	      is NaN.  This macro is not equivalent to x  !=  y	 because  that
	      expression is true if x or y is NaN.

       isunordered()
	      is true if x or y is NaN and false otherwise.

NOTE
       Not  all	 hardware supports these functions, and where it doesn't, they
       will be emulated by macros. This will give you a	 performance  penalty.
       Don't use these functions if NaN is of no concern for you.

CONFORMING TO
       C99

SEE ALSO
       fpclassify(3) isnan(3)

				  2002-07-27			  ISGREATER(3)
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